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Metal Injection Molding of Co-28Cr-6Mo

From Advanced Powder Products, Inc.
 

 
Metal injection molding of gas- and water-atomized Co-28Cr- 6Mo powders is evaluated. Sintering is conducted in different atmospheres to evaluate their effects on sintering response and carbon, nitrogen, and oxygen contents. The effects of hot isostatic pressing and heat treat on the mechanical properties are investigated. Properties are correlated to the interstitial content and microstructure. Optimized processing gives mechanical properties that exceed ASTM requirements for cast and wrought Co-28Cr-6Mo.

Cobalt-chromium alloys are commonly used for surgical implants because of their high strength, superior corrosion resistance, non-magnetic behavior, and biocompatibility. Applications include prosthetic replacements of hips, knees, elbows, shoulders, ankles, and fingers; bone plates, screws, staples, and rods; and heart valves [1]. Material properties for various compositions and processing routes are covered by a number of ASTM specifications. Co-28Cr-6Mo is a common composition and can be cast (ASTM F75), wrought (ASTM F1537), or forged (ASTM F799). Due to the shape complexity of surgical implants, casting is often the selected processing route. For higher volume applications, metal injection molding (MIM) can compete favorably with castings on cost.

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